Introduction

The Tokina AF 12-24mm f/4 AT-X Pro DX is a representative of Tokina's pro-grade AT-X Pro
(Advanced Technology - Extra Professional) lineup which is especially renowned for outstanding
build quality. Interestingly the optical design of the lens is the result of a joint effort by Tokina
and Pentax. However, both manufacturers have a different approach regarding the actual mechanical
implementation and only the Tokina variant is available for Nikon (and Canon) naturally.

Following Nikon's naming conventions the DX indicates a lens with reduced APS-C image circle
so it is not compatible to full-frame SLRs (though it's still possible to mount and use it).
On the D200 (used for testing) its field-of-view is equivalent to 18-36mm in classic terms so
it's a typical ultra-wide zoom lens here.

Note: the image above shows the Canon variant of the lens.

As already hinted above the build quality of the lens is excellent. No wobbling whatsoever.
The outer shell is made of high-quality polycarbonate whereas the zoom mechanism is made of metal.
The lens has a crinkle finish similar to pro-grade Nikkors giving it a pleasant feel.
The size remains constant during zooming and the front element does not rotate - using
a polarizer is possible without any problems even with attached hood (flower-shaped).
A one-touch focus clutch mechanism makes it possible to switch between manual and auto-focus
by moving the focus ring back and forth. This can be done in any focus position.
The lens has no internal AF motor and relies on a slotted drive screw
operated by the camera. AF speed is a non-issue in this lens class but it's fine enough anyway.